Brunswick Model 31 Combination Radio and Panatrope Radio Service Data SheetFebruary
1930 Radio-Craft

Wax nostalgic about and learn from the history of early electronics.
See articles from Radio-Craft,
published 1929 - 1953. All copyrights are hereby acknowledged.

The Brunswick Panatrope
was billed as the world's first all-electric phonograph (as opposed to the mechanical crank-up models), combined with an
AM radio. It was designed
with the assistance of RCA, many of whose components were integrated into the unit. A video of a restored Panatrope is
embedded on the page below the data sheet.

In
this receiver a radio-record switch, Sw2, cable and input transformer, T4, are used, in order that the low-impedance of
the pick-up may be matched with the relatively high input impedance existing in the primary of T1. Referring to the parts
layout sketch, units TC1, TC2, TC3 and TC4 are trimmer condensers in shunt to the tuning condensers but not shown in the
schematic circuit. This receiver is in three sections: The R.F. chassis, the "SPU" (socket-power-unit) chassis and the dynamic
reproducer. Field current for the latter is supplied by the SPU. Note that operation of the receiver should not be attempted
unless either the field coil of a dynamic or a 600-ohm resistor is connected across the terminals for the two "field" leads;
this resistor must be capable of carrying 100 ma. To facilitate service, the RF. chassis and SPU chassis are bolted to a
single mounting board which, in turn, may be removed from the cabinet by removing retaining bolts at the rear of the mounting
board...

Brunswick Model 31 Combination Radio and Panatrope Radio Service Data Sheet

Restored Brunswick Panatrope

Posted June 9, 2016

Radio Service Data Sheets

These schematics, tuning instructions, and other data are reproduced from my
collection of vintage radio and electronics magazines. As back in the era, similar
schematic and service info was available for purchase from sources such as
SAMS Photofacts, but these printings
were a no-cost bonus for readers. There are 220 Radio Service Data Sheets as of
February 2, 2018.

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas
and reference material while performing my work as an RF system and circuit design engineer.
The Internet was still largely an unknown entity at the time and not much was available
in the form of WYSIWYG
...

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